Library Documents

Document Type: Article

Document Title: HALT and HASS Testing: Learning to Handle the Big Guns

Summary:

When HALT and HASS are implemented correctly, they provide a fast, cost-effective path to greater product reliability and customer satisfaction, as well as reduced warranty costs.

Source: COTS Journal

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Document Title: IEEE- Long-term Thermal Overstressing of Computers

Author: Kirk Gray and Michael Pecht

Summary:

Significant opportunities exist to reduce costs in the design, manufacture and operation of systems by allowing higher use specification temperatures. This paper shares the findings and observations of an experimental study where operating computers were subjected to high steady state temperatures and thermal syscling well beyond their design specifications. The reults sugges that significant cost savings can be realized without compromising reliability by abandoning the fundamentally flawed yet long held perception and belief that reliability is mainly temperature driven. This result could enable significant cost savings obtained by extending operating and environmental conditions for both testing and end-use.

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Document Title: Vibration Test Techniques Shake the Status Quo

Summary:

COTS gear often needs to be modified to withstand pre-production thermal ramping and random vibration stimulation, collectively called HALT, and must be able to withstand post-production highly accelerated stress screening (HASS).

Source: COTS Journal

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Document Type: Guideline

Document Title: Applied R&M Manual for Defence Systems Part C – Supporting Theory : CHAPTER 45 ENVIRONMENTAL STRESS SCREENING

Author: Safety and Reliability Society, UK

Summary:

The UK's Safety and Reliability Society (SaRS), released a 26 page, in-depth paper on the process and technology behind Environmental Stress Screening, and the effective benefits achieved by your overall reliability program. Download and read it today!

Source: SaRS Applied R&M Manual for Defence Systems

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Document Title: HALT Testing Guidelines

Author: Qualmark

Summary:

Qualmark's 2010 HALT Testing Guidelines were first released in 1998 to provide guidance in HALT standards development. The HALT Testing Guidelines define the process elements necessary to successfully implement and perform HALT testing. Adherence to the HALT Testing Guidelines will provide the fundamental reference for implementing and operating effective HALT testing in a HALT chamber. The document can be used as a basis for developing HALT standards for professional organizations and businesses seeking to define effective HALT testing practices.

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Document Title: HASS/HASA Testing Guidelines

Summary:

Qualmark's HASS/HASA Testing Guidelines, define the process elements to successfully implement and perform HASS or HASA. It identifies equipment requirements, fixture design and qualification, functional and troubleshooting requirements, and Proof of Screen (PoS)development. Adherence to this document will provide the fundamental guidelines to implement and operate a successful HASS or HASA. The document can be used as a basis for developing standards for professional organizations and businesses seeking to define effective HASS practices.

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Document Title: Qualmark_IPC9592A_HALT-HASS.pdf

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Document Title: Standard for Measuring HALT/HASS Utility Consumption

Summary:

Consumption of utilities (LN2, electricity and compressed air) over the usable life of a HALT\HASS system is typically many times the initial purchase cost of the equipment. For this reason, utilities cost are a key factor in determining the Total Cost of Ownership of a HALT\HASS system, and should be carefully compared prior to purchasing a HALT\HASS System. However, comparing utility consumption and costs are not easy. Different makers of systems use different methods of specifying utility consumption; some firms reportedly don’t even accurately measure consumption but rather provide simple estimates without substantiating data. The purpose of this document is to define a method for accurately and consistently measuring utility consumption of HALT\HASS chamber systems.

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Document Type: Product and Services Collateral

Document Title: 2010 Qualmark Product Catalog - Advanced Accelerated Testing Solutions to Help the World Make Better Products

Summary:

Qualmark's 2010 product catalog explains how HALT and HASS/HASA technology provides optimum product reliability faster and better than traditional methods. It outlines Qualmark products, professional services. online training, maintenance offerings and lab facilities - all of which are designed to enhance product quality, your product testing process and ultimate return on investment.

Qualmark is the largest global manufacturer of accelerated reliability testing systems for performing HALT (Highly Accelerated Life Tests) and HASS (Highly Accelerated Stress Screens). Qualmark supports more HALT/HASS chamber systems, has conducted more HALT/HASS tests, and offers more HALT/HASS expertise than any other company in the world.

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Document Title: Qualmark Data Acquisition Packages

Author: Qualmark

Summary:

Qualmark’s latest data acquisition offerings present the test engineer with an array of options for flexibility and portability while providing a stable platform for high speed data export from Qualmark’s TyphoonTM and QFusionTM systems.

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Document Title: Qualmark Post Warranty Support Services

Summary:

Qualmark offers four levels of service to help keep accelerated testing and production work on track - full maintenance, calibration and preventative maintenance service, extended parts warranty and technical support.

For application support, consider Qualmark’s Web Based Education, which is offered at a discount with all post-warranty service plans, or ask about Qualmark’s Professional Services programs.

Click to open the document below for more information regarding Qualmark's Post Warranty Support Plans.

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Document Title: Qualmark’s 2012 Introduction of QFusion™

Summary:

Qualmark’s 2012 Introduction of QFusion™ (patent pending) represents a breakthrough in Accelerated Stress Test technology. It is the first ever production specific HASS/HASA (Highly Accelerated Stress Screen/Audit) system plus it fuses accelerates stress testing with the more traditional Burn-In, which it performs faster and less expensively than traditional chambers.

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Document Type: Symposium Paper

Document Title: Highly Accelerated Stressing of Products With Very Low Failure Rates

Summary:

A Case Study of HASA at Hewlett Packard; The early development process of designing Highly Accelerated Stress Auditing of circuit card assemblies at Hewlett Packard.

Source: Institute of Environmental Science and Technologies (IEST)

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Document Type: Whitepaper

Document Title: Benefits & Costs of Overstress HALT/HASS Testing

Author: Dr. Edmond L. Kyser

Summary:

Describes how a well-executed HALT and/or HASS plan can increase your ROI.

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Document Title: Explaining Accelerated Aging

Author: Dr. Joseph Capitano

Summary:

Describes the theory and practice of using thermal stresses to accelerate aging in electrical and mechanical components.

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Document Title: HALT Reliability Study: Is Your Reliability Testing Program Keeping Pace with Manufacturing and Design Advancements?

Author: Qualmark

Summary:

This product reliability test study compares accelerated stress tests conducted at Qualmark labs 10 years ago, as measured against more recent results. The study yielded significant differences in the ratios and types of failures found.

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Document Title: HALT/HASS Testing Benefits Outline

Author: Neill Doertenbach

Summary:

Describes the techniques of HALT and HASS and their advantages over standard Design Verification Testing.

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Document Title: Highly Accelerated Life Testing; Testing With a Different Purpose

Author: Neill Doertenbach

Summary:

Describes the techniques of HALT and HASS and their advantages over standard Design Verification Testing.

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Document Title: Return on Investment from HALT

Author: Dr. Edmund Kyser

Summary:

Provides a formula that can be utilized to show Return on Investment for a well-executed accelerated reliability test program.

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Document Title: The Calculation of gRMS

Author: Neill Doertenbach

Summary:

Describes the metric of gRMS, how it is calculated in both the frequency and time domains and what factors can cause variations in gRMS.

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Document Title: Understanding HALT/HASS System Specifications

Author: Tom Peters

Summary:

Provides a useful overview of HALT/HASS chamber systems, their specifications, why they are different from DVT, and how to know which specifications are important for your program.

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Document Title: Using Empirical Reliability Tools to Estimate the Effect of HASS on Product Field Life

Author: Qualmark

Summary:

Qualmark is often asked by those new to HALT and HASS test techniques, "how do I know that I am not damaging the field life of my product by performing HASS on my production units"?

The simple answer is, the stress levels for HASS are determined by appropriately guard-banding HASS screens based on the results of HALT. A Proof of Screen (PoS)is first perfomed to confirm the stresses that can be safely applied to production units without over-stressing good products, while still detecting latent defects in marginal products.

This paper provides a deeper discussion for determinig the effects of HASS on product field life.

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